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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5072d08f30ec1f5458337f8e12c71eaf88ee63de7a8100c7dc9d1eb49fb7fd1' 
  AND token = 'mltnnloB1zeMnAxCgtlGHwj0tSLBa1W3qkht/7qKpFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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