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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1680051a1f82e0959846f9a5772435a95ea1b8d8557e9ee3ab4714c1c5d1d46' 
  AND token = 'jXCQgJeWa/6CyW7gBmpTgibLA23TpyUajqWJ68GHRU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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