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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2709e147b4be797391803e6d26fad6f1d1bcb99f121f341710ba612293062729' 
  AND token = 'yYKHSgFqlch6kEbTJyo1BJWr25yvyloI84AmvUWhd9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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