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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d6d6373f835f140ba7bfca99ff2e2db1c061bef01821b7fbb7f9d139b8bcf7c' 
  AND token = 'qqWFCsccDZiCgNItMLGEvf9VRi4jk5cSAfOxSKzpiWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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