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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '108368a21f4d24f897d90d5f914067fcdd4e63519fed62d18e8bc8d26ea9e6b9' 
  AND token = 'AfwfxA7VSaRJA0FmBZ+hC3pJUb2xg3uyjS2IZtdWrD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}