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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '040ab45f5504521be60c7993a475c28f5be27ede7d3b72c3512bea01aacee98d' 
  AND token = '7iK34KBrQb5SmGA1FaS4KGS8StcdWUQUB9/J2kE7vq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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