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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e0f9f3ab14970f1bdefef03d3a2bdf6a20d93bf7e0af747d8a6b1da81eea21a' 
  AND token = 'X3CYPqnMRHUoQgAlv7zl5eooOFW1tW/HOr0jAnGWlfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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