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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97ebe8a03c561810c1c8f7a14f96b818056bc0f31ee91f5eb90a3d327cf655ae' 
  AND token = 'ZUCNQAs/w4IMB4z2iSWgSCvaCiQHs3Srmt3tk2Lz+1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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