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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e672abac2cf402aa9120a1c88530cce4f0fc0bb079a6b3fd55a667e7ab47884' 
  AND token = 'uD0N/3XVB2u8oGLLeK91eN7PQZ7LdSI2xr2JSqjKUsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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