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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '511f2dfc0c8d696446fbc9e6947686ca921727e070e428f0a9539909d33104d9' 
  AND token = 'NzhR8ggh3amJzhFhi0iYeKRbn1nmH3AsxHnGfka0+pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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