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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c88ec7792c1a12d656bde2263b156240f6b68adf2acf39079d8bcda66d12e937' 
  AND token = '4jDLh3iYl98Sfx+ufBcqdVaa2BKcvsb6sd/Z5yW1v38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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