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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36219b7f5da1b735fa2430c451a9380f782f8522cf5941e9837424536acb9ddc' 
  AND token = 'Iofy+hTija6Gi7o5WnaWvuk+jxj+Sude1Q5m2XwrOCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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