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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee3dc223bfbf1e7094c2dde9618e1ff834c18070047c80d03e8960a9b0cc619b' 
  AND token = 'fspY7d4abUKP0N1GF+2JFwHDBkpJKK/mMOnJjSWof4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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