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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2355e3c603a5c2d1797079e9d025d25e082aca24f3663c59794237245f37698' 
  AND token = 'cZkYGOrTmlteIfTo3r8f7HfHY/WY5pBB0mBJdFpkZbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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