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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'befe4c418d2fefa8c8f187c76acf331e2237e16d992dca4c200e4c1af881a08c' 
  AND token = 'Zx8wcKXO6hdbCy2s7Xj2+A/EP3UeLhuz8pgix1KDXLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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