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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78441d599a81e85b94795513fdf55fba51384898fef3f30cc9db492f2bae028f' 
  AND token = '5+wPp8rTAs2McqhE9zPgRB202I2L5r3bC3b8fOVi7iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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