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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3078ef3a50e06330a3726b40b5076ebb83219dbe08cc4df4b3e2018f7161db81' 
  AND token = 'lNcNKAk2+QQ0qVCYMy1xSqUuGQydscpe4kKdjuBDC0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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