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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67efef092d0cfdb3dfc2f41484fd7219657dac633159b137e988bda79e4ac80d' 
  AND token = 'h0KO3gwW87WUt3MzwC+d7T9B8wzJx3UM+I79Uq7nIas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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