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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2b96843b70fe2b71a1bf1f36fd916a7d61480eac4075b9c41c4a0ace7fddda1' 
  AND token = 'POMgR0hsXQGpQkJsL/emU2zD6Pb9OQyP0AfKu7CV6Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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