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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13fcd41b5690a39dfa7d536e47d1b792a26142c1beabd0587f8056dac9647667' 
  AND token = 'qru4LjxP98YbyAOESaGzJWOW7Svn7klgdqCQCy/D5ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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