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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4ec7c31165717e36e5a2b0f9b38e637a04fe2541a575fb4238e3e83a29cd496' 
  AND token = '5xtYsG1VUnAWsb4oEYhzUOrmPPXP6XncMXmfCtl/LbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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