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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed28fe0c5440649d2ada9dc9a7fb72fd49f68cd9cd442ccc4d29a7ddba98cb5d' 
  AND token = '56wju8emhpZc8gK7BY7XW3uPkVClHxV6Y+y5SQtS0pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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