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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a39a78b755816c6763a99158257fe8f8af1b2f412131890a598b8e80638172ed' 
  AND token = 'uxi6IQ3kE7u2hzQKww3noM0bo+URQuT0nphNuz0Z+gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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