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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6f2cc12e2abcebf4c668a0c24ff11832909d9a3ee521948cd9477409728947e' 
  AND token = 'qXLti8VMX2KbgmXpBPinVnSqhitym/2hIa+Cf7xZKQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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