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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d94e5372aba426fbb4f0071613ab2070a3205fd50049310ce701899a4735ca9' 
  AND token = 'FOLith3U81n/m879kPmVjBg8rMeQZjIiSCTM2ssO72A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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