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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b9401dea96a1170263557829af01ecf48b3119970ef40256369dda2c24913a8' 
  AND token = 'oq1vqNxyYPdrrJXNd3NYd62u+VJczVuHDtpQV6ar33s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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