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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '674c282952bb3038bb068371c5fae6069d3e42a5183134179ac06d3b7376d2d0' 
  AND token = 'vMRZGOJtsyaYSjiWNd33w0FuuWgMPUwMeDMMVmHIQ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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