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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03f900fb85c44d0ae359247e56e8f94b4de4832e1a93d1aab035164c893ab0c8' 
  AND token = 'ATw9K55K1y/MxI8DfowStRti6u3ul5H3vb1LW2PNLsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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