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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51988e3e2cbf44072c4a9de19d8008a73ee8cecafe631a2307ce873af2a8be6c' 
  AND token = '0AtOyeg11ETAP7Xxbm8x1tRxZfXS4c3UQYNRnjLx98w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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