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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01de9ae2be592f9e1fb4d56e37343bb9e8b42d0da12a9e2a52600d185de0be74' 
  AND token = 'QES+mpsHRCdc19oUH1EajigY/cU3X1vUa3DFPXxACRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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