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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6c762236d84919bb62f1f9b638aa8ba058555ca98640aecde61af80da5430ec' 
  AND token = '2tI3uILrVIjoS4epSSoIxNEhmyRbQWTpnibsc5vYW4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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