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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64d867c1730f83450e7a2a98802c5a2b619e8d5391a7785d15131f5a443a7194' 
  AND token = 'dQ9iQCvnJRFsSH+o7Ot19K28BCMzj38clE40Ewq3L4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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