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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f16a6e6c2e050bcd04f9f0a296bd0203ad71ffe60303fba3dd044e88b1b1109' 
  AND token = 'xehCBJnipTSYxhUVTUTJFsAUB2MGGnAqa5PKXV15Ucc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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