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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35f2c7c95fbe2ed9777312e4cb43c2c5902ee54a51a20676e2b67dda6f901739' 
  AND token = 'o064r8IGX1XP8HFtkVvnUcUpFtvIkwdtK+hkrYotwAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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