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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0c1921e6b75938991da3e952ce6b420b73e73101a159f155aa0cfedb19549a0' 
  AND token = '0olHJAjcy9tUXSd1Vt+KFcea6rsoZPVtYBXqpOPpuDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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