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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4677f60e5cb7412f7c0a4a16b26abc407836003a2cc7946a194af51bb2f846fd' 
  AND token = '3CPR3+O9U9pU4R0UondYYHWXTDvbaemi6O1RHAPKfqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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