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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '201fa15d319e06a31b4d0eff9a54af32006b483f0b03f2591690cd6636de1fff' 
  AND token = 'clgZ6M5RoOO3yn/GmXwuKOmQ2PWF7pjQY7TkbJxEQNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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