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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ed1584e109b95998f00d4e00f68ac706a03814af5d44e4a754382cca430384b' 
  AND token = 'f3k7qC6aI6XJk338DvlPBr9+Gudx5KCubWoBZzcqJz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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