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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e238d45f4540d55b6846c004888f23317b7a23e1c01fec50222e6ef02db82da4' 
  AND token = 'Gjqk3ehCJODjH7DWioUqaxH07VAcq289GfATGwUm1OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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