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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '184d8c865e803a413d0b08947df2e742e74b80af331e3a53f0f4774f4845b89f' 
  AND token = 'w7yCtAtCtq3tF152RntZNF3jMUta5uGJ47WzY81VMnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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