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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65460693b598ee565a0e4d772d85ae164a59210c396548e71161d4c234a6fa52' 
  AND token = 'pkiq7q7NUwh7ToG7I/qNnKGV6sFW54i20TVjwi8qsok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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