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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbfe3cd51e61515dd8853ac7d8e6af7cb7881cde6576559ca818ff6fa4b54b90' 
  AND token = 'hDUZlRvK5oPz09GTNHAOEuhRZcEDqbR0eCoyU7RWk3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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