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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bcee885d0d8839206ae669cec012466e50be7ad4f0c667a381ff9646b096300' 
  AND token = '/HNmawlYXCQuQvmAm3raQm4DRy4aV+L0HQamVV1XVkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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