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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bd41d8ef3ba53ae4a973596075488b09b483ff01d82c4deb33a16b3db430896' 
  AND token = '+xLXbEeUE937nHfG34VGVPNAn2FIX/ZhkCQNa1LrY84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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