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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e544402a7795915e39e401c5d67cf47ec03edff43d2c8cacc1d357527a4f20f' 
  AND token = 'obBlbkBm/yeEDh0feOTjF/j78bSFYZtyM2UYQ0aspjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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