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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4b71a8ef4da16433799bdeb9512ffe0f3786abcc80a7626f086283e88e83e3' 
  AND token = '0oLZ4bxAZOAyZX1hl/zZTyyA/OjficlTJIB+e2usaM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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