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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c753952f589cbf3e6549d5b24284b85c04f4713a12dbc8cb301217e0049c10d' 
  AND token = '6BwCf9t1t3CBADgOLjZE0AX0pXi0imiHonk3qxwwmLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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