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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e9a4114f9f91c3dab009add109931caf9096624047f53d89d6940cf32024661' 
  AND token = 'LSsWY7CtcbbSdg1IStNtFLaPjSKU8mpW4iv2CNB7V+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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