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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3baa9adeb2a7ec19e4a5b5590074d25a841845fe1d058fb359806c23bf1778f' 
  AND token = 'NCW60bdzkPmC1UmmduSuT9kGwkpsrpr2+EuGrUldDsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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