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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a7b53243a3b0b86c3c02ccdd499e4ffc757f63b68c07749f3758fce36de7a7c' 
  AND token = '1fayABLn+FrRzcddBR1gwbsM2ZATz6iU+u5uq4HTUTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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