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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '301fcf534c40053c8ae66bdd0eff9b0179964537ad18d9f4a066f8237439a696' 
  AND token = 'x6V89wpfh8E5A14+V0tBMZs8jiEHHwWB71ob3zeNDV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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